Qbstoimg ajto polishing machime



C. DAUSMANN.

GRINDING AND POLISHING MACHINE.

APPLICATION FILED JULY 20 ms.

1,303,861, I Patented May 20, 1919.

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GRINDING AND POLISHING- MACHINE.

Specification of Letters fatent.

Patented May 20, 1919.

' Application filed Euly 20, 1916. Serial No. 110,272.

To all whom it may concern:

Be it known that I, CHARLES DAUSMANN, a citizen of the United States, and resident of the borough of Brooklyn, county of Queens, State of New York, have invented certain new and useful Improvements in Grinding and Polishing Machines, of which the following is a specification.

The present invention relates to improvements in grinding and polishing machines, and particularly such machines for grinding and polishing copper cylinders for use in the production of photogravures. As is well known the surface of these cylinders must be absolutely smooth, as the minutest scratch will show in the print.

An object of the present invention is to provide a machine by which such cylinders may be polished in a manner superior to that produced by hand, and with such saving in time as to insure the more extensive use commercially of such printed methods, employing copper cylinders. Another object is to provide such a machine which is automatlc in operation, so that when once started, no attention will be necessary during the polishing of the cylinder.

With these and other objects in view, my invention is shown in the accompanying drawings, and will be hereinafter more fully described with reference'thereto, and finally pointed out in the claims.

In the accompanying drawings,

Figure 1 is a front view of my improved machine,

Fig. 2 is a top view of the polishing and grinding mechanism, and

Fig. 3 is a side view thereof.

Similar reference characters indicate corresponding parts throughout the several figures of the drawings.

Referring to the drawings, and more particularly to Fi 1 thereof, my inventlon comprises a tab e 10, upon which is slidably mounted a bed-plate 11, having standards 12 and 13 mounted thereon, provided with bearings 14 and 15, in which are mounted the eccentric ends 16 and 17 of a shaft 18, upon the projecting end of which there is provided a driving pulley 19 and a dead pulley 20.

The polishing stone holder comprises a tilting frame or lever supported in bearings 21 and 22, engaging the shaft 18, the frame portions 23 an 24 extending rearwardly and forwardly therefrom. At the forward end of the frame ortion 24, a halved ring portion 25 is provlded, the halves being secured together by bolts passin through the flanges 26 and 27 thereof, and a revolving stone holding member 28 is mounted therein. The stone holding member is enlarged as at 29 and 30, above and below the rin 25, the

. intermediate reduced portion 29* Fig. 3)

and is of the type known to the trade as a Hare stone.

Bearings 36 and 37 are mounted above the bearings 21 and 23, and a shaft 38 is mounted therein, having at one end a driving pulley 39, and provided intermediate the bearings with a bevel gear 40, which meshes with a bevel gear 41, on the end of a shaft 42, mounted in bearings 43 and 44, and provided at its other end with another bevel gear 41 which meshes with the gear Wheel 31, thereby rotating the polishing stone upon turning of the shaft 38.

The frame portion 23 is provided with a slida'ble weight 45, which may be adjusted by means of a hand wheel 46, and screw 47 to regulate the balance and force of the stone holder in polishing. The shaft 18 with its eccentric ends, imparts forward and backward, and upward and downward motion to the stone holder, the stone being at the same time rotated by the shaft 38. This motion simulates in its effect the action of the hand in polishing copper cylinders.

The copper cylinder 47' to be polished is mounted beneath the stone in bearings 48 and 49 of forwardly extending supports 50 and 51, secured to the table. The end portions of this cylinder are shown in Fig. 1, the central portion being omitted to facilitats illustration of other parts. A trough 52 (shown broken a-wa in Fig. 1), is disposed beneath the cy inder and contains water in which the cylinder is revolved. The cylinder is turned by means of a gear 53 driven by a pinion 54 on one end of a shaft 55. A pulley 56 is disposed on the other end'of the shaft and a belt 57 connects it with a driving pulley 58 on a drive shaft 59. H

The polishing meansis reciprocated backward and forward along the length of the copper cylinder, by means of a worm 60 or lead screw, mounted beneath the table of the machine, and connected to the bedll by means of a lead screw nut 61 adapted to be engaged and disengaged therefrom by a lever 62 which operates an eccentric 63. The lead screw is turned by means of reversing pulleys 64 and 65, between which there is provided-an idle pulley 66. Two bolts 67 and 68, one of which is reversed, are mounted one upon the idle pulley and the other upon one of the pulleys 64 and 65, and connected to the driving pulley 69, also upon the shaft 59. A belt shaped lever 70 pivotally mounted upon -a bracket 71 is connected at its lower end with the belts 67 and 68, and at its upper end to a slide rod 72 extending the length of the machine, and provided with stops 73 and 74 adapted to be engaged by downwardly extending lugs 75 provided at each end of the bed 11. As the bed approaches the extremity of its movements in one direction, the lug 75 engages the stop and by its momentum carries the rod 72 a suflicient distance to move the belts, so that the belt previously running on the idle pulley is moved to the driving pulley,

and the other belt is moved to the idle pulley, thereby reversing the rotation of the lead screw, and causing the bed and polishing means to movein the other direction. At the end of the lead screw 60, there is provided a ar 76 which is driven by a drum 77 provided at the lower portion of the table, through the gears 78, 79 and 80, these gears being mounted upon a pivoted plate 81 so that they may be thrown out of mesh with the gear 76 when desired. The drum 77 drives the belts 82 and 83 which are connected to the pulleys 19, .20 and 39 which drive the polishing mechanism.

A seat 84 is provided on the bed 11, on which is secured a tool rest of any ordinary kind (not shown), when it is desired to turn down the copper cylinder before polishing, or when the cylinder is not properly centered. The polishing mechanism is then made inoperative by disconnecting the driving gears from, the gear 7 6.

In operation, itwill be seen the bed 11 moves back and forth in front of the revolving copper cylinder, and at the same time the polishing stone is rotated and given an'u-p and down movement. The adjustable weight permits the pressure upon the arm as desired, and enables its being balanced so that the movement is similar to that producel by the hand, but with much greater spee I have illustrated and described a preferred and satisfactory form of my invention, but it is obvious that changes may be made therein within the spirit and scope thereof, as defined in theappended claims.

-mounted on said frame, means for reciprocating said carriage parallel with the axis of said cylinder, a tilting frame pivoted on said carriage, a rotary polishing stone supported on said tilting frame in position to engage said cylinder, and means for rotating said polishing stone.

2. A printing cylinder polishing machine comprising a frame, means for supportin thereon a printing cylinder to be polishe means for rotating said cylinder, a carriage mounted on saidframe, means for reciprocating said carriage parallel with the axis of said cylinder, a tilting frame pivotedon said carriage, a rotary polishing stone supported on said tilting frame in position to engage said cylinder, a counter weight on said tilting frame for regulating and re lieving the ressure of said polishing stone, and means or rotating said polishing stone.

3. A printin cylinder polishing machine comprising a rame, means for supporting thereon a printing cylinder to be polished, means for rotating said cylinder, a carriage mounted on said frame, means for reciprocating said carriage parallel with the axis of said cylinder, a shaft supported in bearings of said carriage and provided with eccentrics, a tilting frame supported on said eccentrics, means for operating said shaft, a polishing stone supported on said tilting frame in position to engage said cylinder, and means for rotating said polishing stone.

4. A printin cylinder polishing machine comprising a rame, means for supporting thereon a printing cylinder to be polished, means for rotatin said cylinder a carriage mounted on said rame, means for reciprocating said carriage parallel with the axis of said cylinder, a shaft supported in bearings of said carria e and provided with eccentrics, a tilting ame supported on said eccentrics, means for operating said shaft, a polishing stone supported on said tilting frame in position to engage said cylinder, and means connected with said shaft for rotating said polishing stone.

5. A printing cylinder polishing machine comprising a frame, means for supporting thereon a printing cylinder to be polished, means for rotating said cylinder, a carriage mounted on said frame, means for reciprocating said carriage parallel with the axis of said cylinder, a shaft supported in bearings of said carriage and provided with eccentrics, a tilting frame supported on said eccentrics, means for operating said shaft, a olishing stone supported on said tilting frame in position to engage said cylinder a counter 'weight on said tilting frame for regulating and relieving the pressure of said polishing stone, and means for rotating said polishing stone.

6. In a polishing and grinding machine, a polishing or grinding stone adapted to bear upon the surface to be ground, means for rotating said stone, a lever supporting said stone, pivoted means for said lever, said lever being eccentrically journaled upon said pivot means, and means for rotating said pivot means adapted to reciprocate said lever and said stone backward and forward.

7. In a polishing and grinding machine, a v

polishing or grinding stone adapted to bear upon the surface to be ground, a lever supporting said stone, means for rotating said stone, and means for imparting an up and down and a forward and rearward movement to the lever at the fulcrum thereof.

In testimony, that I claim the foregoing as my invention, I have signed my name in presence of two subscribing witnesses.

CHARLES DAUSMAN N. Witnesses:

A. Y. COUGAN, D. LEWIS MA'I'IERN. 

